Basilica of St. Mark
A Byzantine wonder that looks more like Istanbul than Italy, the 11th-century Basilica di San Marco is covered in domes, lined with golden mosaics, and filled with ancient art treasures.
St. Peter's Basilica
Vatican City, Vatican City
St. Peter's Basilica in Vatican City is the world headquarters of Roman Catholicism and one of the largest churches in the world. Founded by Constantine the Great in 324, it stands over the tomb of Saint Peter the Apostle.
Mission San Diego de Alcalá
San Diego, CA, USA
Completed in 1813, this church served the mission founded by Fray Junipero Serra in 1769. It was also used as an Indian school and boys' home.
Basilica of Our Lady of Guadalupe
Mexico City, Mexico
The most popular Catholic shrine in the world, this modern basilica houses a miraculous image of the Virgin Mary who appeared to an Aztec convert in 1531.
Church of All Nations (Basilica of the Agony)
Funded by several nations and completed in 1924, this basilica stands over the traditional site where Jesus prayed on the night of his betrayal.
This great basilica with a giant copper dome was built in honor of St. Joseph, the patron saint of Canada.
Santa Maria in Trastevere
This church is held to be the first place of Christian worship in Rome, built where a fountain of oil sprung up on the day of Christ's birth. Inside are many excellent mosaics.
Basilica of the Annunciation
Completed in 1969, this Catholic basilica stands on the traditional site where the angel Gabriel announced to Mary that she would bear the Savior. It is built over Crusader and Byzantine foundations.
Aula Palatina (Basilica of Constantine)
Built in 310, this imposing brick structure was the throne hall of Constantine the Great and other Roman emperors. Today it is used as a Protestant church.
Basilica of St. Lawrence outside the Walls
This major pilgrimage basilica features a columned portico, 6th-century mosaic, catacombs, and lovely 12th-century cloister. It is dedicated to Lawrence, who was martyred by roasting on a gridiron.
Santa Maria in Cosmedin
Although best known for the "Mouth of Truth" in the porch, Santa Maria in Cosmedin is one of the most interesting churches in Rome, with an atmosphere of antiquity and some important medieval art.
This ancient basilica was consecrated by St. Ambrose in 387 and rebuilt in the 11th century. It became the model for all Lombard Romanesque churches.